This is a very intelligent and well put-together piece of work. Geoff Nicholson's precises and opinions on each guitarist are definitely worth reading.
And, as he says in the book, if you disagree too greatly with his choices, then you can always write your own book - perhaps a new one for the 2010's!!
Neither solely niche/highbrow in its choice of great guitarists, nor eschewing the obvious greats for the sake of it either, it's a great reference source that I keep referring back to year after year (in fact I lost my original copy, and so have just re-ordered a copy via Amazon).
Well worth buying, reading and keeping.